Relations Between vz and Bx Components in Solar Wind and their Effect on Substorm Onset
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DOI:
10.1002/2017GL076268URI (для ссылок/цитирований):
https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2017GL076268https://elib.sfu-kras.ru/handle/2311/111311
Автор:
Kubyshkina, Marina
Semenov, Vladimir
Erkaev, Nikolay
Gordeev, Evgeny
Dubyagin, Stepan
Ganushkina, Natalia
Shukhtina, Maria
Коллективный автор:
Политехнический институт
Кафедра прикладной механики
Дата:
2018Журнал:
Geophysical Research LettersКвартиль журнала в Scopus:
Q1Квартиль журнала в Web of Science:
Q1Библиографическое описание:
Kubyshkina, Marina. Relations Between vz and Bx Components in Solar Wind and their Effect on Substorm Onset [Текст] / Marina Kubyshkina, Vladimir Semenov, Nikolay Erkaev, Evgeny Gordeev, Stepan Dubyagin, Natalia Ganushkina, Maria Shukhtina // Geophysical Research Letters. — 2018. — Т. 45 (№ 9). — С. 3760-3767Аннотация:
We analyze two substorm onset lists, produced by different methods, and show that the (Bx·vz) product of the solar wind (SW) velocity and interplanetary magnetic field (IMF) components for two thirds of all substorm onsets has the same sign as IMF Bz. The explanation we suggest is the efficient displacement of the magnetospheric plasma sheet due to IMF Bx and SW flow vz, which both force the plasma sheet moving in one direction if the sign of (Bx·vz) correlates with the sign Bz. The displacement of the current sheet, in its turn, increases the asymmetry of the magnetotail and can alter the threshold of substorm instabilities. We study the SW and IMF data for the 15-year period (which comprises two substorm lists periods and the whole solar cycle) and reveal the similar asymmetry in the SW, so that the sign of (Bx·vz) coincides with the sign of IMF Bz during about two thirds of all the time. This disproportion can be explained if we admit that about 66% of IMF Bz component is transported to the Earth's orbit by the Alfvén waves with antisunward velocities.